Download PDF – RRB PH UT27 – Clinical Pathology Practice Test : Diagnostic Organ Function Tests & Urinalysis

RRB PH UT27 – Clinical Pathology Practice Test : Diagnostic Organ Function Tests & Urinalysis

Q1. What formula calculates creatinine clearance (CrCl) from a timed 24-hour urine collection?

A) CrCl = (Serum Creatinine × Urine Volume) / Urine Creatinine

B) CrCl = (Urine Creatinine × Serum Creatinine) / Timed Minutes

C) CrCl = (BUN × 100) / Serum Creatinine

D) CrCl = (Urine Creatinine × Urine Volume in mL) / (Serum Creatinine × Time in minutes)

Q1. 24 घंटे के मूत्र से क्रिएटिनिन क्लियरेंस (CrCl) की गणना का सूत्र क्या है?

A) CrCl=(सीरम क्रिएटिनिन×मूत्र आयतन)/मूत्र क्रिएटिनिन

B) CrCl=(मूत्र क्रिएटिनिन×सीरम क्रिएटिनिन)/समय

C) CrCl=(BUN×100)/सीरम क्रिएटिनिन

D) CrCl=(मूत्र क्रिएटिनिन×मूत्र आयतन)/(सीरम क्रिएटिनिन×समय)

Answer: (D)

Creatinine clearance (CrCl) approximates Glomerular Filtration Rate and is calculated using the formula: CrCl (mL/min) = (U × V) / (P × T), where U is the urinary creatinine concentration (mg/dL), V is the total volume of urine collected (mL), P is the serum creatinine concentration (mg/dL), and T is the collection time expressed in minutes (which equals 1,440 minutes for a standard 24-hour collection).

CrCl=(U×V)/(P×T): U=मूत्र क्रिएटिनिन, V=मूत्र आयतन, P=सीरम क्रिएटिनिन और T=संग्रह समय मिनटों में (24 घंटे के लिए 1440)।

Q2. RBC casts in urine are a hallmark of:

A) Acute pyelonephritis

B) Lower urinary tract infection (cystitis)

C) Acute glomerulonephritis

D) Benign prostatic hyperplasia

Q2. मूत्र में RBC कास्ट किस रोग का प्रमुख संकेत है?

A) तीव्र पायलोनेफ्राइटिस

B) निचले मूत्र पथ का संक्रमण

C) तीव्र ग्लोमेरुलोनेफ्राइटिस

D) सौम्य प्रोस्टेट वृद्धि

Answer: (C)

RBC casts form when erythrocytes leak through disrupted glomerular basement membranes (as occurs in acute glomerulonephritis, nephritic syndrome, or ANCA-associated vasculitis) into the nephron lumen. The red cells become trapped within a cylindrical matrix of polymerized Tamm-Horsfall mucoprotein secreted by the thick ascending limb of Henle, localizing the bleeding origin directly to the renal parenchyma rather than the lower urinary tract.

RBC कास्ट (RBC casts) गुर्दे के भीतर, विशेषकर ग्लोमेरुलर रक्तस्राव (glomerular bleeding) या ग्लोमेरुलोनेफ्राइटिस में बनते हैं और रक्तस्राव का वृक्कीय उद्गम (वृक्कीय उद्गम (renal origin)) दर्शाते हैं।

Q3. A positive urine benzidine/orthotolidine test with no RBCs on microscopy indicates:

A) Heavy contamination with radiographic contrast media

B) Severe urinary tract fungal candidiasis

C) Hemoglobinuria or myoglobinuria (free pigment lysis)

D) Excessive excretion of uric acid dihydrate stones

Q3. मूत्र का बेंज़िडीन/ऑर्थोटोलिडीन परीक्षण सकारात्मक हो, लेकिन माइक्रोस्कोपी में RBC न हों—तो क्या संकेत मिलता है?

A) रेडियोग्राफिक कॉन्ट्रास्ट का संदूषण

B) गंभीर कैंडिडा UTI

C) हीमोग्लोबिन्यूरिया या मायोग्लोबिन्यूरिया

D) यूरिक अम्ल क्रिस्टलों का अत्यधिक उत्सर्जन

Answer: (C)

The chemical benzidine, orthotolidine, and dipstick pseudoperoxidase tests rely on the peroxidase-like catalytic activity of heme to oxidize a chromogen to a blue-green color. A positive test indicates the presence of heme. If microscopic examination shows intact RBCs, hematuria is diagnosed. If microscopic examination shows an absence of RBCs, it indicates free heme in solution—either hemoglobinuria (from intravascular hemolysis) or myoglobinuria (from rhabdomyolysis).

बेंज़िडीन/ऑर्थोटोलिडीन परीक्षण हीम (heme) की परऑक्सीडेज-जैसी (peroxidase-like) गतिविधि पहचानते हैं। मूत्र में RBC न होने पर मुक्त हीमोग्लोबिन या मायोग्लोबिन (हीमोग्लोबिन्यूरिया/मायोग्लोबिन्यूरिया) संभावित कारण हैं।

Q4. The bromocresol green (BCG) dye-binding assay measures serum:

A) Albumin

B) Urea nitrogen

C) Conjugated bilirubin

D) Alkaline phosphatase

Q4. BCG डाई-बाइंडिंग परीक्षण किस सीरम घटक को मापता है?

A) एल्ब्यूमिन

B) यूरिया नाइट्रोजन

C) संयुग्मित बिलिरुबिन

D) अल्कलाइन फॉस्फेटेज़

Answer: (A)

Bromocresol green (BCG) dye-binding is the most widely adopted manual and automated clinical spectrophotometric method for measuring serum albumin. At an acidic pH of 4.2, albumin acts as a cation and binds selectively to the anionic BCG dye, shifting the dye's absorption maximum and producing an intense blue-green complex measured photometrically at 628–630 nm, with absorbance directly proportional to albumin concentration.

BCG अम्लीय (acidic) pH पर एल्ब्यूमिन से बंधकर रंग परिवर्तन करता है; अवशोषण (absorbance) से सीरम एल्ब्यूमिन मापा जाता है। यह एक व्यापक विधि है, पर इसमें ग्लोब्युलिन का हस्तक्षेप (globulin interference) संभव है।

Q5. Ehrlich's reagent gives a cherry-red color with increased urinary:

A) Porphobilinogen only

B) Urobilinogen

C) Homogentisic acid

D) Bence Jones proteins

Q5. एर्लिख अभिकर्मक मूत्र में किस पदार्थ के बढ़े स्तर पर चेरी-लाल रंग देता है?

A) केवल पोर्फोबिलिनोजेन

B) यूरोबिलिनोजेन

C) होमोजेंटिसिक अम्ल

D) बेंस-जोन्स प्रोटीन

Answer: (B)

Ehrlich's aldehyde test detects urobilinogen in fresh urine. p-Dimethylaminobenzaldehyde in concentrated hydrochloric acid reacts with the alpha-pyrrole carbons of urobilinogen to yield a condensation product displaying an intense cherry-red coloration. Peak physiological excretion of urobilinogen occurs in the afternoon (2 PM to 4 PM), making timed collections useful in hemolytic anemia.

एर्लिख अभिकर्मक यूरोबिलिनोजेन से चेरी-लाल रंग का उत्पाद बनाता है। ताज़ा मूत्र में इसका परीक्षण किया जाता है।

Q6. Which condition raises both serum ALP and GGT?

A) Physiological third-trimester pregnancy

B) Active osteoblastic bone growth in pediatric puberty

C) Severe osteomalacia and Paget's disease of bone

D) Hepatobiliary cholestasis or extrahepatic biliary obstruction

Q6. ALP और GGT दोनों का बढ़ना किस स्थिति का संकेत है?

A) तीसरी तिमाही का सामान्य गर्भ

B) बच्चों में सक्रिय अस्थि वृद्धि

C) गंभीर ऑस्टियोमलेशिया/पेजेट रोग

D) हेपेटोबिलियरी कोलेस्टेसिस या पित्त अवरोध

Answer: (D)

Both Alkaline Phosphatase (ALP) and Gamma-Glutamyl Transferase (GGT) are anchored to the canalicular and biliary epithelial membranes. In cholestasis or extrahepatic biliary obstruction (e.g., gallstones or pancreatic head carcinoma), detergent actions of bile acids induce the synthesis and shedding of both enzymes into serum. In isolated bone diseases (Paget's disease, osteosarcoma), ALP is markedly elevated while GGT remains strictly normal.

कोलेस्टेसिस/पित्त अवरोध में ALP और GGT दोनों बढ़ते हैं। अस्थि रोग में ALP बढ़ सकता है, लेकिन GGT सामान्य रहता है।

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