Urinary system overview US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Urinary system overview. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Urinary system overview US Medical PG Question 1: A 29-year-old man presents to his primary care provider complaining of testicular pain. He reports a four-day history of dull chronic pain in his left testicle that is worse with standing. His past medical history is notable for asthma and major depressive disorder. He takes inhaled albuterol as needed and sertraline. He is sexually active with a single female partner and always uses barrier protection. His temperature is 99.2°F (37.3°C), blood pressure is 125/75 mmHg, pulse is 85/min, and respirations are 17/min. Physical examination reveals a non-tender twisted mass along the left spermatic cord that disappears when the patient lies supine. This patient’s condition most likely stems from decreased laminar flow at which of the following vascular junctions?
- A. Descending aorta – Left testicular artery
- B. Left testicular vein – Left suprarenal vein
- C. Left testicular vein – Inferior vena cava
- D. Left testicular vein – Left renal vein (Correct Answer)
- E. Left testicular vein – Left internal iliac vein
Urinary system overview Explanation: ***Left testicular vein – Left renal vein***
- This clinical presentation of a **nontender, twisted mass along the spermatic cord** that disappears when supine is classic for a **varicocele**. Varicoceles are more common on the left side due to the **anatomic drainage of the left testicular vein** into the left renal vein at a **perpendicular angle**.
- This perpendicular angle, along with the **increased length of the left testicular vein** and its drainage into the higher-pressure left renal vein, creates conditions for **increased hydrostatic pressure** and **decreased laminar flow**, leading to venous engorgement and varicocele formation.
*Descending aorta – Left testicular artery*
- This junction involves an **artery**, not a vein. Varicoceles are caused by **venous insufficiency and dilatation**, not arterial issues.
- The left testicular artery branches directly from the aorta and supplies blood to the testicle; problems with this junction would typically manifest as **ischemia or arterial insufficiency**, not venous congestion.
*Left testicular vein – Left suprarenal vein*
- While the left suprarenal vein also drains into the left renal vein, the **left testicular vein does not directly connect to the left suprarenal vein**.
- This junction is not anatomically relevant to the direct drainage pathway causing a varicocele.
*Left testicular vein – Inferior vena cava*
- The **right testicular vein drains directly into the inferior vena cava**, explaining why varicoceles are less common on the right side.
- The left testicular vein typically drains into the left renal vein, not directly into the inferior vena cava.
*Left testicular vein – Left internal iliac vein*
- The **left internal iliac vein primarily drains pelvic structures** and has no direct anatomical connection or primary drainage role for the left testicular vein.
- The testicular veins follow a retroperitoneal course and do not typically involve the internal iliac venous system in their main drainage.
Urinary system overview US Medical PG Question 2: A healthy 30-year-old female has a measured creatinine clearance of 100 mL/min. She has a filtration fraction (FF) of 25%. Serum analysis reveals a creatinine level of 0.9 mg/dL and an elevated hematocrit of 0.6. Which of the following is the best estimate of this patient’s renal blood flow?
- A. 1.2 L/min
- B. 600 mL/min
- C. 800 mL/min
- D. 400 mL/min
- E. 1.0 L/min (Correct Answer)
Urinary system overview Explanation: ***1.0 L/min***
- The **renal plasma flow (RPF)** can be calculated by dividing the **creatinine clearance (which approximates GFR)** by the **filtration fraction (FF)**: RPF = GFR / FF = 100 mL/min / 0.25 = 400 mL/min.
- To find the **renal blood flow (RBF)**, we use the formula RBF = RPF / (1 - Hematocrit). Given RPF = 400 mL/min and Hematocrit = 0.6, RBF = 400 mL/min / (1 - 0.6) = 400 mL/min / 0.4 = 1000 mL/min, or **1.0 L/min**.
*1.2 L/min*
- This value would result if the hematocrit were lower (e.g., 0.5) or if the GFR or FF were different, leading to an incorrect RPF or RBF calculation.
- It does not align with the provided values when applying the standard physiological formulas relating GFR, FF, RPF, and hematocrit.
*600 mL/min*
- This value might be obtained if the hematocrit was significantly underestimated or if the RPF calculation was incorrect in determining the RBF.
- It arises from using an incorrect formula or misinterpreting the relationship between plasma flow and blood flow.
*800 mL/min*
- This result would occur if the calculation for RPF or the subsequent RBF was erroneous, possibly by using an incorrect denominator in the RBF formula.
- For example, if RPF was incorrectly assumed to be 320 mL/min and divided by 0.4 (1-Hematocrit).
*400 mL/min*
- This value represents the calculated **renal plasma flow (RPF)**, not the **renal blood flow (RBF)**.
- RBF is always higher than RPF because it includes both plasma and cellular components of blood.
Urinary system overview US Medical PG Question 3: A 46-year-old woman presents to the clinic complaining that she “wets herself.” She states that over the past year she has noticed increased urinary leakage. At first it occurred only during her job, which involves restocking shelves with heavy appliances. Now she reports that she has to wear pads daily because leakage of urine will occur with simply coughing or sneezing. She denies fever, chills, dysuria, hematuria, or flank pain. She has no significant medical or surgical history, and takes no medications. Her last menstrual period was 8 months ago. She has 3 healthy daughters that were born by vaginal delivery. Which of the following tests, if performed, would most likely identify the patient’s diagnosis?
- A. Methylene blue dye
- B. Post-void residual volume
- C. Urodynamic testing
- D. Estrogen level
- E. Q-tip test (Correct Answer)
Urinary system overview Explanation: ***Q-tip test***
- The patient's symptoms (leakage with coughing/sneezing, lifting heavy objects, vaginal deliveries, recent cessation of menses) are classic for **stress urinary incontinence**, often due to **urethral hypermobility**.
- The **Q-tip test** assesses urethral hypermobility by measuring the angle of deflection of a sterile cotton swab inserted into the urethra during a Valsalva maneuver. An angle >30 degrees from the horizontal indicates hypermobility.
*Methylene blue dye*
- **Methylene blue dye** is primarily used to identify **vesicovaginal or ureterovaginal fistulas**, where dye would be seen leaking into the vagina.
- The patient's symptoms do not suggest a fistula, but rather a problem with sphincter control during increased abdominal pressure.
*Post-void residual volume*
- **Post-void residual volume (PVR)** measures the amount of urine left in the bladder after urination, primarily used to diagnose **overflow incontinence** or **urinary retention**.
- The patient's symptoms are inconsistent with overflow incontinence, which typically involves frequent dribbling or incomplete emptying rather than leakage specifically with physical exertion.
*Urodynamic testing*
- **Urodynamic testing** is a more comprehensive and invasive evaluation that includes cystometry, pressure-flow studies, and electromyography, often used to differentiate types of incontinence when the diagnosis is unclear.
- While it can diagnose stress incontinence, less invasive tests like the Q-tip test are typically preferred as a first step for **urethral hypermobility** before proceeding to complex urodynamic studies.
*Estrogen level*
- An **estrogen level** might be relevant if **atrophic vaginitis** or **urethritis** due to estrogen deficiency were suspected, which can contribute to urgency or mixed incontinence.
- While the patient is peri-menopausal, her primary symptoms (leakage with exertion) are more indicative of structural weakness (stress incontinence) rather than estrogen-related tissue atrophy or inflammation.
Urinary system overview US Medical PG Question 4: On cardiology service rounds, your team sees a patient admitted with an acute congestive heart failure exacerbation. In congestive heart failure, decreased cardiac function leads to decreased renal perfusion, which eventually leads to excess volume retention. To test your knowledge of physiology, your attending asks you which segment of the nephron is responsible for the majority of water absorption. Which of the following is a correct pairing of the segment of the nephron that reabsorbs the majority of all filtered water with the means by which that segment absorbs water?
- A. Distal convoluted tubule via passive diffusion following ion reabsorption
- B. Distal convoluted tubule via aquaporin channels
- C. Thick ascending loop of Henle via passive diffusion following ion reabsorption
- D. Proximal convoluted tubule via passive diffusion following ion reabsorption (Correct Answer)
- E. Collecting duct via aquaporin channels
Urinary system overview Explanation: ***Proximal convoluted tubule via passive diffusion following ion reabsorption***
- The **proximal convoluted tubule (PCT)** is responsible for reabsorbing approximately **65-70% of filtered water**, making it the primary site of water reabsorption in the nephron.
- This water reabsorption primarily occurs **passively**, following the active reabsorption of solutes (especially **sodium ions**), which creates an osmotic gradient.
*Distal convoluted tubule via passive diffusion following ion reabsorption*
- The **distal convoluted tubule (DCT)** reabsorbs a much smaller percentage of filtered water (around 5-10%) and its water reabsorption is largely **regulated by ADH**, not primarily simple passive diffusion following bulk ion reabsorption.
- While some passive water movement occurs, it is not the main mechanism or location for the majority of water reabsorption.
*Distal convoluted tubule via aquaporin channels*
- While aquaporin channels do play a role in water reabsorption in the DCT, particularly under the influence of **ADH**, the DCT is not the segment responsible for the **majority of all filtered water absorption**.
- The bulk of water reabsorption occurs earlier in the nephron, independently of ADH for the most part.
*Thick ascending loop of Henle via passive diffusion following ion reabsorption*
- The **thick ascending loop of Henle** is primarily involved in reabsorbing ions like Na+, K+, and Cl- but is largely **impermeable to water**.
- Its impermeability to water is crucial for creating the **osmotic gradient** in the renal medulla, which is necessary for later water reabsorption.
*Collecting duct via aquaporin channels*
- The **collecting duct** is critically important for **regulated water reabsorption** via **aquaporin-2 channels** under the influence of **ADH**, allowing for fine-tuning of urine concentration.
- However, it reabsorbs only a variable portion (typically 5-19%) of the remaining filtered water, not the **majority of all filtered water**.
Urinary system overview US Medical PG Question 5: A 22-year-old male college student volunteers for a research study involving renal function. He undergoes several laboratory tests, the results of which are below:
Urine
Serum
Glucose
0 mg/dL
93 mg/dL
Inulin
100 mg/dL
1.0 mg/dL
Para-aminohippurate (PAH)
150 mg/dL
0.2 mg/dL
Hematocrit
50%
Urine flow rate
1 mL/min
What is the estimated renal blood flow?
- A. 1,500 mL/min (Correct Answer)
- B. 200 mL/min
- C. 3,000 mL/min
- D. 1,000 mL/min
- E. 750 mL/min
Urinary system overview Explanation: ***Correct: 1,500 mL/min***
- Renal Plasma Flow (RPF) is calculated using the formula: RPF = (Urine Flow Rate × Urine PAH concentration) / Plasma PAH concentration = (1 mL/min × 150 mg/dL) / 0.2 mg/dL = 750 mL/min.
- Renal Blood Flow (RBF) is then calculated from RPF and hematocrit (Hct) using the formula: RBF = RPF / (1 - Hct). Given Hct = 50% or 0.5, RBF = 750 mL/min / (1 - 0.5) = 750 / 0.5 = **1,500 mL/min**.
*Incorrect: 200 mL/min*
- This value is not consistent with the calculation for renal blood flow based on the provided PAH clearance and hematocrit.
- It might incorrectly represent a fraction of the actual renal blood flow or be derived from an erroneous formula.
*Incorrect: 3,000 mL/min*
- This value would result if the hematocrit was incorrectly subtracted from RPF instead of being used in the denominator, or if there was a calculation error in the RPF.
- An RBF of 3,000 mL/min would imply a much higher RPF, which is not supported by the given PAH concentrations and urine flow.
*Incorrect: 1,000 mL/min*
- This value is incorrect and does not result from the proper application of the formulas for RPF and RBF with the given data.
- It might be a miscalculation of RPF or an incorrect estimation of the hematocrit's impact.
*Incorrect: 750 mL/min*
- This value represents the calculated **Renal Plasma Flow (RPF)**, not the Renal Blood Flow (RBF).
- To get RBF, you must account for the hematocrit to include both plasma and red blood cells.
Urinary system overview US Medical PG Question 6: A 75-year-old male presents to the emergency room complaining of severe lower abdominal pain and an inability to urinate. He reports that he last urinated approximately nine hours ago. When asked to urinate, only a few drops dribble from the tip of his penis. Further questioning reveals that the patient has experienced progressively worsening difficulty with urinating over the past two years. He has lived alone for five years since his wife passed away. He has not seen a doctor in that time. His temperature is 98.8°F (37.1°C), blood pressure is 145/90 mmHg, pulse is 115/min, and respirations are 22/min. He appears to be in severe pain. Physical examination reveals a distended bladder and significant tenderness to palpation over the inferior aspect of his abdomen. Which of the following sets of lab values would most likely be found in a urinalysis of this patient?
- A. Urine osmolality 550 mOsmol/kg H2O, Urine Na+ 15 mEq/L, FENa 0.9%, red blood cell casts
- B. Urine osmolality 400 mOsmol/kg H2O, Urine Na+ 25 mEq/L, FENa 1.5%, no casts
- C. Urine osmolality 300 mOsmol/kg H2O, Urine Na+ 45 mEq/L, FENa 5%, no casts (Correct Answer)
- D. Urine osmolality 200 mOsmol/kg H2O, Urine Na+ 35 mEq/L, FENa 3%, muddy brown casts
- E. Urine osmolality 600 mOsmol/kg H2O, Urine Na+ 15 mEq/L, FENa 0.8%, hyaline casts
Urinary system overview Explanation: ***Urine osmolality 300 mOsmol/kg H2O, Urine Na+ 45 mEq/L, FENa 5%, no casts***
- The patient's presentation with acute urinary retention due to **benign prostatic hyperplasia (BPH)** and subsequent obstructive uropathy leads to **postrenal acute kidney injury (AKI)**. If the obstruction is prolonged, it can lead to kidney damage and an inability to concentrate urine effectively, resulting in an **isosthenuric** urine (osmolality near plasma, ~300 mOsmol/kg H2O) and a higher fractional excretion of sodium (**FENa > 2-3%**).
- **No casts** are typically seen in pure postrenal AKI unless superimposed intrinsic renal damage has occurred. The increased urine Na+ and FENa reflect tubular dysfunction due to prolonged obstruction.
*Urine osmolality 550 mOsmol/kg H2O, Urine Na+ 15 mEq/L, FENa 0.9%, red blood cell casts*
- This profile suggests **prerenal azotemia** with a low FENa and concentrated urine, indicating appropriate kidney response to hypoperfusion, which is not the primary issue here. **Red blood cell casts** indicate glomerulonephritis, typically seen in intrinsic renal disease, which is not supported by the patient's presentation of obstructive uropathy.
*Urine osmolality 400 mOsmol/kg H2O, Urine Na+ 25 mEq/L, FENa 1.5%, no casts*
- This urine profile suggests an intermediate state, possibly early or resolving prerenal injury, but not classic for established postrenal AKI. The **FENa is still relatively low**, indicating some preserved tubular function, which would be compromised in prolonged obstruction leading to AKI.
*Urine osmolality 200 mOsmol/kg H2O, Urine Na+ 35 mEq/L, FENa 3%, muddy brown casts*
- **Muddy brown casts** are characteristic of **acute tubular necrosis (ATN)**, and while ATN can be a complication of prolonged postrenal obstruction, it is not the initial or most direct finding for postrenal AKI. Also, an osmolality of 200 mOsmol/kg H2O would suggest significant inability to concentrate urine, common in ATN, but the presence of muddy brown casts is the key differentiating feature.
*Urine osmolality 600 mOsmol/kg H2O, Urine Na+ 15 mEq/L, FENa 0.8%, hyaline casts*
- This profile is highly suggestive of **prerenal azotemia**, characterized by a **highly concentrated urine** (high osmolality) and **low urinary sodium and FENa**, indicating robust renal sodium and water reabsorption in response to perceived hypovolemia. While hyaline casts can be seen in prerenal states, the overall picture does not fit the obstructive cause of AKI described.
Urinary system overview US Medical PG Question 7: A 66-year-old G3P3 presents with an 8-year-history of back pain, perineal discomfort, difficulty urinating, recurrent malaise, and low-grade fevers. These symptoms have recurred regularly for the past 5–6 years. She also says that there are times when she experiences a feeling of having a foreign body in her vagina. With the onset of symptoms, she was evaluated by a physician who prescribed her medications after a thorough examination and recommended a vaginal pessary, but she was non-compliant. She had 3 vaginal deliveries She has been menopausal since 51 years of age. She does not have a history of malignancies or cardiovascular disease. She has type 2 diabetes mellitus that is controlled with diet and metformin. Her vital signs include: blood pressure 110/60 mm Hg, heart rate 91/min, respiratory rate 13/min, and temperature 37.4℃ (99.3℉). On physical examination, there is bilateral costovertebral angle tenderness. The urinary bladder is non-palpable. The gynecologic examination reveals descent of the cervix to the level of the introitus. A Valsalva maneuver elicits uterine procidentia. Which pathology is most likely to be revealed by imaging in this patient?
- A. Renal cyst
- B. Urinary bladder polyp
- C. Renal tumor
- D. Hydronephrosis (Correct Answer)
- E. Renal calculi
Urinary system overview Explanation: ***Hydronephrosis***
- The patient's **uterine procidentia** (third-degree uterine prolapse) can lead to **ureteral kinking** or compression, causing obstruction of urine flow.
- This obstruction, combined with recurrent back pain, malaise, low-grade fevers, and CVA tenderness, strongly suggests **hydronephrosis** due to urinary stasis and potential recurrent UTIs.
*Renal cyst*
- While common, renal cysts are typically **asymptomatic** and do not explain the recurrent fevers, malaise, and CVA tenderness.
- They are generally **not associated with urinary obstruction** leading to such systemic symptoms.
*Urinary bladder polyp*
- Bladder polyps can cause hematuria or urinary frequency but are **unlikely to cause bilateral CVA tenderness**, back pain, or systemic symptoms like fever and malaise.
- They do not typically lead to **ureteral obstruction** or hydronephrosis.
*Renal tumor*
- A renal tumor could explain systemic symptoms like malaise and low-grade fevers, but the recurrent nature over 5-6 years and the strong association with **uterine prolapse-induced obstruction** make it less likely.
- While it can cause back pain, **bilateral CVA tenderness** and difficulty urinating are not classic presenting features.
*Renal calculi*
- Renal calculi cause **severe, colicky flank pain** that radiates, and while they can cause urinary obstruction and recurrent UTIs, the patient's long-standing, constant back pain and the context of significant **uterine prolapse** make hydronephrosis a more direct consequence.
- The symptoms described are more indicative of **chronic obstruction** rather than acute stone passage.
Urinary system overview US Medical PG Question 8: An investigator is studying physiologic renal responses to common medical conditions. She measures urine osmolalities in different parts of the nephron of a human subject in the emergency department. The following values are obtained:
Portion of nephron Osmolality (mOsmol/kg)
Proximal convoluted tubule 300
Loop of Henle, descending limb 1200
Loop of Henle, ascending limb 250
Distal convoluted tubule 100
Collecting duct 1200
These values were most likely obtained from an individual with which of the following condition?
- A. Gitelman syndrome
- B. Psychogenic polydipsia
- C. Furosemide overdose
- D. Dehydration (Correct Answer)
- E. Diabetes insipidus
Urinary system overview Explanation: ***Dehydration***
- The high osmolality in the **collecting duct (1200 mOsmol/kg)** indicates the kidney is actively conserving water, a normal physiological response to **dehydration**.
- In dehydration, **antidiuretic hormone (ADH)** levels are high, leading to increased water reabsorption in the collecting ducts and thus a concentrated urine.
*Gitelman syndrome*
- This condition involves a defect in the **NaCl cotransporter** in the **distal convoluted tubule**, leading to impaired sodium reabsorption.
- Patients typically present with significant **hypokalemia**, metabolic alkalosis, and a relatively dilute urine, which is not consistent with the given osmolality values.
*Psychogenic polydipsia*
- Individuals with psychogenic polydipsia consume excessive amounts of water, leading to **dilute urine** (low urine osmolality) as a compensatory mechanism to excrete the excess water.
- This would result in much lower osmolality values throughout the nephron, particularly in the collecting duct, compared to the values provided.
*Furosemide overdose*
- Furosemide is a **loop diuretic** that inhibits the reabsorption of sodium and chloride in the **thick ascending limb of the loop of Henle**.
- This would impair the kidney's ability to concentrate urine, leading to a much **lower osmolality in the collecting duct** than observed in this scenario.
*Diabetes insipidus*
- Diabetes insipidus (DI) is characterized by either a deficiency in ADH (central DI) or unresponsiveness to ADH (nephrogenic DI).
- In both types, the kidney cannot concentrate urine effectively, resulting in the production of a **large volume of very dilute urine** (low urine osmolality, typically <300 mOsmol/kg), which contradicts the high collecting duct osmolality.
Urinary system overview US Medical PG Question 9: A 40-year-old sailor is brought to a military treatment facility 20 minutes after being involved in a navy ship collision. He appears ill. He reports a sensation that he needs to urinate but is unable to void. His pulse is 140/min, respirations are 28/min, and blood pressure is 104/70 mm Hg. Pelvic examination shows ecchymoses over the scrotum and perineum. There is tenderness over the suprapubic region and blood at the urethral meatus. Digital rectal examination shows a high-riding prostate. Abdominal ultrasound shows a moderately distended bladder. X-rays of the pelvis show fractures of all four pubic rami. Which of the following is the most likely cause of this patient's symptoms?
- A. Tearing of the anterior urethra
- B. Rupture of the corpus cavernosum
- C. Tearing of the posterior urethra (Correct Answer)
- D. Tearing of the ureter
- E. Rupture of the bladder
Urinary system overview Explanation: ***Tearing of the posterior urethra***
- The combination of **pelvic fractures**, **blood at the urethral meatus**, inability to void despite a sensation to do so, and a **high-riding prostate** are classic signs of posterior urethral injury.
- The posterior urethra, particularly the membranous portion, is vulnerable to shear forces and tearing during severe pelvic trauma.
*Tearing of the anterior urethra*
- Anterior urethral injuries are typically associated with a **straddle injury** or direct trauma to the perineum, not necessarily pelvic fractures.
- While blood at the meatus can occur, the **high-riding prostate** and extensive pelvic fractures point away from an isolated anterior injury.
*Rupture of the corpus cavernosum*
- This is usually a result of "penile fracture" during sexual intercourse and presents with sudden pain, detumescence, and a characteristic "eggplant" deformity, which are not described here.
- It does not explain the inability to void, high-riding prostate, or association with pelvic fractures.
*Tearing of the ureter*
- Ureteral injuries are typically associated with penetrating trauma or iatrogenic injury during surgery; they rarely occur with blunt pelvic trauma of this nature.
- Symptoms would include flank pain, hematuria, or urine leakage into the retroperitoneum, not significant urethral bleeding or a high-riding prostate.
*Rupture of the bladder*
- Bladder rupture can be intra- or extraperitoneal and is often associated with pelvic fractures. However, it typically causes gross hematuria and often free fluid in the peritoneum (intraperitoneal rupture) or extravasation into the space of Retzius (extraperitoneal rupture).
- While a distended bladder is noted, the presence of **blood at the urethral meatus** and a **high-riding prostate** strongly implicate urethral injury rather than primarily bladder rupture.
Urinary system overview US Medical PG Question 10: A 22-year-old Caucasian male is stabbed in his left flank, injuring his left kidney. As the surgeon undertakes operative repair, she reviews relevant renal anatomy. All of the following are correct regarding the left kidney EXCEPT?
- A. The left kidney has a longer renal vein than the right kidney
- B. The left kidney underlies the left 12th rib
- C. The left kidney moves vertically during deep breathing
- D. The left kidney has a longer renal artery than the right kidney (Correct Answer)
- E. The left kidney lies between T12 and L3
Urinary system overview Explanation: ***The left kidney has a longer renal artery than the right kidney***
- The **aorta** lies to the left of the midline, so the **right renal artery** must traverse a greater distance to reach the right kidney.
- Therefore, the right renal artery is longer than the left renal artery.
*The left kidney has a longer renal vein than the right kidney*
- The **inferior vena cava (IVC)** is positioned to the right of the midline, requiring the **left renal vein** to cross the aorta to drain.
- This anatomical arrangement makes the left renal vein longer than the right renal vein.
*The left kidney underlies the left 12th rib*
- The kidneys are retroperitoneal organs, and the 12th rib provides significant posterior protection for **both kidneys**.
- The superior pole of the left kidney typically extends to the level of the **11th and 12th ribs**.
*The left kidney moves vertically during deep breathing*
- The kidneys are surrounded by **perirenal fat** and are influenced by the diaphragm's movement.
- During **deep inspiration**, the diaphragm descends, causing both kidneys to move vertically by 2-3 cm.
*The left kidney lies between T12 and L3*
- The kidneys are situated in the retroperitoneum, generally extending from the level of the **T12 vertebra** to the **L3 vertebra**.
- The left kidney is typically positioned slightly higher than the right kidney.
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