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Question 1
What is the lower reference limit for serum potassium?
- 3.5 mEq/L
- 4.5 mEq/L
- 5.0 mEq/L
- 6.0 mEq/L
Question 2
The lower reference limit for serum sodium is 136 mEq/L.
- True
- False
Question 3
The lower reference limit for serum calcium is ___.
Fill in the blank
Question 4
What is the lower reference limit for serum creatinine?
- 0.6 mg/dL
- 1.2 mg/dL
- 2.0 mg/dL
- 3.5 mg/dL
Question 5
What is the lower reference limit for serum cortisol at 8:00 AM?
- 5 µg/dL
- 3 µg/dL
- 0 µg/dL
- 8 µg/dL
Question 6
The lower reference limit for arterial blood pH on room air is 7.35.
- True
- False
Question 7
What is the lower reference limit for serum creatine kinase (CK) in females?
- 10 U/L
- 25 U/L
- 15 U/L
- 40 U/L
Question 8
What is the lower reference limit for serum ferritin in males?
- 15 ng/mL
- 12 ng/mL
- 10 ng/mL
- 25 ng/mL
Question 9
In pregnancy, which gestational age range has a lower reference limit of 60 for total serum estriol?
- 32–36 weeks
- 24–28 weeks
- 28–32 weeks
- 36–40 weeks
Question 10
The lower reference limit for serum amylase is 25 U/L.
- True
- False
Question 11
The lower reference limit for serum bicarbonate (HCO₃⁻) is ___.
Fill in the blank
Question 12
What is the lower reference limit for follicle-stimulating hormone (FSH) in postmenopausal females?
- 40 mIU/mL
- 10 mIU/mL
- 4 mIU/mL
- 25 mIU/mL
Question 13
What is the lower limit of normal for arterial blood PO2 when breathing room air?
- 75 mmHg
- 85 mmHg
- 65 mmHg
- 95 mmHg
Question 14
The lower limit of normal for fasting serum glucose is 70 mg/dL.
- True
- False
Question 15
The lower limit of normal for serum IgA is ____ mg/dL.
Fill in the blank
Question 16
Which immunoglobulin has 0 IU/mL as its lower limit of normal?
- IgA
- IgE
- IgG
- IgM
Question 17
The lower limit of normal for serum IgG is 650 mg/dL.
- True
- False
Question 18
During provocative arginine stimulation, the growth hormone peak should be at least what value?
- 0 ng/mL
- 7 ng/mL
- 0.7 ng/mL
- 70 ng/mL
Question 19
The lower limit of normal for serum iron is ____ mcg/dL.
Fill in the blank
Question 20
What is the lower limit of normal for 2-hour postprandial serum glucose?
- 70 mg/dL
- 100 mg/dL
- 140 mg/dL
- 200 mg/dL
Question 21
Fasting growth hormone during arginine stimulation has a lower limit of normal of 0 ng/mL.
- True
- False
Question 22
The lower limit of normal for serum IgM is ____ mg/dL.
Fill in the blank
Question 23
Which lab value pair is correctly matched with its lower limit of normal?
- IgA – 650 mg/dL
- IgE – 0 IU/mL
- IgG – 40 mg/dL
- IgM – 76 mg/dL
Question 24
The lower limit of normal for 2-hour postprandial serum glucose is 140 mg/dL.
- True
- False
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