Which parameter is used to identify Diabetes mellitus?

Appeared in: MP CHO -2021 (Shift 1st)

Explanation

Glycosuria, the presence of glucose in the urine, is a key indicator of hyperglycemia, the hallmark of diabetes mellitus.
It occurs when blood glucose levels exceed the renal threshold for reabsorption, which is approximately 180 mg/dL.
When the renal tubules are saturated with glucose, the excess is spilled into the urine, making it a detectable parameter for suspecting diabetes.

Option A: Albuminuria, the presence of albumin in the urine, is a marker of kidney damage (nephropathy).
Option B: High SGPT (Serum Glutamic Pyruvic Transaminase), also known as ALT, is an enzyme primarily found in the liver. Elevated levels are indicative of liver cell injury.
Option D: Urea is the main nitrogenous waste product of protein metabolism and is normally excreted by the kidneys into the urine.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Biochemical markers for Diabetes Mellitus as background academic context rather than a clinical decision trigger.
A key nursing responsibility is to understand the difference between screening tests and diagnostic tests. Glycosuria is a useful screening finding, but a definitive diagnosis of diabetes requires blood tests like FPG or HbA1c.
Nurses often perform urine dipstick tests which can detect glycosuria, prompting further investigation for diabetes.
Patient education is crucial. A nurse would explain that while glucose in the urine suggests high blood sugar, monitoring long-term control is best done with an HbA1c test, which reflects average blood glucose over the past 2-3 months.

How to Approach the Question

First, analyze the question's core requirement: identifying a parameter for 'Diabetes mellitus'.
Recall the basic pathophysiology of diabetes: it is a disorder of glucose metabolism characterized by hyperglycemia (high blood sugar).
Evaluate each option in the context of glucose metabolism and kidney function.
Option A (Albuminuria): Relate this to protein and kidney damage, a complication, not a primary identifier.
Option B (High SGPT): Recognize this as a liver enzyme, unrelated to the primary diagnosis of diabetes.
Option C (Glycosuria): Connect this directly to hyperglycemia. High blood glucose overwhelms the kidneys' ability to reabsorb it, causing it to appear in the urine.

Concept Tested & Keywords

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E6 Textbook of Biochemistry for medical StudentsDM Vasudevan Part 1 (pp 26-370 of 370) p. 188-190

E6 PATHOLOGY QUICK REVIEWBased on Harsh Mohan Textbook of PATHOLOGY p. 251-253

E6 Biochemistry U Satyanarayana— Part 2 (pp 421-820 of 840) p. 314-316

Practise the full MP CHO -2021 (Shift 1st)

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