Which of the lab value would the nurse to be evaluated for a patient with pancreatitis?

Appeared in: KPSC Staff Nurse - 2018

Explanation

Serum lipase is the most specific and sensitive enzyme for diagnosing acute pancreatitis, making it the test of choice.
Its levels rise within 4-8 hours of symptom onset, peak around 24 hours, and remain elevated for 8-14 days, providing a longer diagnostic window compared to serum amylase.
A lipase level that is three or more times the upper limit of normal is highly indicative of acute pancreatitis.
Unlike amylase, lipase levels are not typically affected by salivary gland disorders, which increases its specificity for pancreatic injury.

Option B: Serum CPK (Creatine Phosphokinase) is an enzyme found primarily in the heart, brain, and skeletal muscle. It is a marker for muscle damage, not pancreatic inflammation.
Option C: Serum ALP (Alkaline Phosphatase) is mainly associated with the liver, bile ducts, and bones. It is not a primary marker for pancreatic cell injury.
Option D: Serum AST (Aspartate Aminotransferase) is an enzyme found in high concentrations in the liver, heart, and muscle cells. It is not specific to the pancreas.

Clinical Relevance

Nursing practice connection: Use the key finding related to Diagnostic laboratory tests for acute pancreatitis to guide bedside assessment, documentation, and the next nursing action.
A nurse's primary role is to collect the blood sample correctly, monitor for the results, and promptly report critically high lipase levels to the healthcare provider to ensure timely diagnosis and intervention.
Nurses should monitor for signs and symptoms of pancreatitis, such as severe epigastric pain radiating to the back, nausea, vomiting, and fever, and correlate these with lab findings.
Patient education is key. The nurse should explain the need for fasting (NPO status) to rest the pancreas and reduce the stimulation of enzyme secretion.

How to Approach the Question

First, identify the key condition mentioned in the question, which is 'pancreatitis'.
Next, recall the primary laboratory markers used to diagnose this specific condition.
Think about the function of the pancreas, which is to produce digestive enzymes. An inflamed pancreas will leak these enzymes into the blood.
Evaluate each option based on its primary organ association. Ask yourself, 'Which enzyme is most specific to the pancreas?'
Eliminate options that are markers for other organs: CPK (muscle), ALP (liver/bone), and AST (liver).
This leaves Serum lipase, which is known to be the most specific and sensitive marker for pancreatic injury.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 2 p. 644-646

E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 2 — Subpart A (pp 1-239 of 478) p. 40-42

E6 Nelson Textbook of Pediatrics(2024) — Volume 2 p. 209-211

Practise the full KPSC Staff Nurse - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.