Question:
With reference to lead poisoning, match List I (Agent) with List II (Amount) and select the correct answer using the codes given below the list.
List I (Agent) List II (Amount) A. Coproporphyrin in urine 1. > 70 mcg/100 ml B. Aminolevulinic acid in urine 2. > 5 mg/L C. Lead in urine 3. > 150 mcg/L D. Lead in blood 4. > 0.8 mg/L
With reference to lead poisoning, match List I (Agent) with List II (Amount) and select the correct answer using the codes given below the list.
| List I (Agent) | List II (Amount) |
|---|---|
| A. Coproporphyrin in urine | 1. > 70 mcg/100 ml |
| B. Aminolevulinic acid in urine | 2. > 5 mg/L |
| C. Lead in urine | 3. > 150 mcg/L |
| D. Lead in blood | 4. > 0.8 mg/L |
Show Hint
Blood lead above 70 mcg/100 ml is the classic lead poisoning cut-off; match the rest around it.
Updated On: Jul 7, 2026
- A-1, B-2, C-4, D-3
- A-3, B-4, C-2, D-1
- A-1, B-4, C-2, D-3
- A-3, B-2, C-4, D-1
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question gives four laboratory markers used to monitor lead poisoning (List I) and four cut-off amounts (List II), and asks which pairing is correct.
Step 2: Key Formula or Approach:
Occupational health monitoring of lead exposure uses fixed biological threshold limits for blood lead, urine lead, urinary delta-aminolevulinic acid (ALA) and urinary coproporphyrin. Matching each marker to its accepted alert value solves the question.
Step 3: Detailed Explanation:
Lead in blood: a blood lead level above 70 mcg per 100 ml (70 mcg/dL) is the accepted level indicating significant lead absorption needing action, so D pairs with 1.
Aminolevulinic acid in urine: a urinary ALA level above 5 mg/L is used as a screening marker of lead's effect on heme synthesis, so B pairs with 2.
Coproporphyrin in urine: a level above 150 mcg/L in urine reflects disturbed porphyrin metabolism from lead toxicity, so A pairs with 3.
Lead in urine: a urine lead level above 0.8 mg/L is the accepted alert threshold, so C pairs with 4.
Putting these together gives A-3, B-2, C-4, D-1, which is option (d) among the codes listed.
The other three code combinations mix up these values, for example option (a) wrongly pairs D (lead in blood) with 3 instead of 1, so they are incorrect.
Step 4: Final Answer:
The correct pairing is A-3, B-2, C-4, D-1.
\[ \boxed{\text{A-3, B-2, C-4, D-1}} \]
The question gives four laboratory markers used to monitor lead poisoning (List I) and four cut-off amounts (List II), and asks which pairing is correct.
Step 2: Key Formula or Approach:
Occupational health monitoring of lead exposure uses fixed biological threshold limits for blood lead, urine lead, urinary delta-aminolevulinic acid (ALA) and urinary coproporphyrin. Matching each marker to its accepted alert value solves the question.
Step 3: Detailed Explanation:
Lead in blood: a blood lead level above 70 mcg per 100 ml (70 mcg/dL) is the accepted level indicating significant lead absorption needing action, so D pairs with 1.
Aminolevulinic acid in urine: a urinary ALA level above 5 mg/L is used as a screening marker of lead's effect on heme synthesis, so B pairs with 2.
Coproporphyrin in urine: a level above 150 mcg/L in urine reflects disturbed porphyrin metabolism from lead toxicity, so A pairs with 3.
Lead in urine: a urine lead level above 0.8 mg/L is the accepted alert threshold, so C pairs with 4.
Putting these together gives A-3, B-2, C-4, D-1, which is option (d) among the codes listed.
The other three code combinations mix up these values, for example option (a) wrongly pairs D (lead in blood) with 3 instead of 1, so they are incorrect.
Step 4: Final Answer:
The correct pairing is A-3, B-2, C-4, D-1.
\[ \boxed{\text{A-3, B-2, C-4, D-1}} \]
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