Which of the following pairs of blood tests is appropriate for a fasting specimen?

Rationale

Glucose and triglycerides are appropriate for a fasting specimen.

These tests require fasting because the levels of glucose and triglycerides can be significantly affected by recent food intake, leading to inaccurate results. Fasting for at least 8-12 hours ensures that these measurements reflect baseline values, which are crucial for assessing metabolic and cardiovascular health.

A (Glucose and triglycerides) CORRECT

Both glucose and triglycerides are commonly measured in fasting blood tests to assess metabolic health. Elevated levels of glucose can indicate diabetes, while high triglycerides are linked to cardiovascular risk. Fasting ensures that these results are not influenced by recent dietary intake, allowing for accurate diagnosis and management.

B (BUN and alkaline phosphatase) YOUR ANSWER

Blood urea nitrogen (BUN) levels can be affected by hydration status rather than fasting, and alkaline phosphatase levels are not significantly influenced by food intake. Thus, these tests do not specifically require a fasting specimen, making them inappropriate choices for this context.

C (Creatinine and total protein) YOUR ANSWER

Creatinine is a measure of kidney function and is generally stable regardless of recent food intake. Similarly, total protein levels are not substantially altered by fasting. Therefore, these tests can be performed without the need for a fasting specimen.

D (Lactate dehydrogenase and albumin) YOUR ANSWER

Lactate dehydrogenase (LDH) levels are typically not influenced by fasting, and albumin levels remain relatively stable regardless of dietary intake. Consequently, these tests do not require fasting and are not suitable for this question regarding fasting specimens.

Conclusion

Fasting is critical for specific blood tests to ensure accurate readings, particularly for glucose and triglycerides. These tests reflect metabolic states that can be skewed by recent meals. In contrast, the other pairs of tests listed do not require fasting, as their results are not significantly affected by food intake, underscoring the importance of choosing appropriate tests based on fasting requirements.

Which of the following pairs of blood tests is appropriate for a fasting specimen?

Glucose and triglycerides are appropriate for a fasting specimen.

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