Tests Affected by Diurnal Variation, Posture, and Stress Flashcards
1
Q
Peaks 4-6 AM; lowest 8 PM-12 AM; 50% lower at 8 PM than at 8 AM; increased with stress
A
Cortisol
2
Q
Lower at night; increased with stress
A
Adrenocorticotropic hormone
3
Q
Lower at night; higher standing than supine
A
Plasma renin activity
4
Q
Lower at night
A
Aldosterone
Insulin
5
Q
Higher in afternoon and evening
A
Growth hormone
Acid phosphatase
6
Q
Increases with exercise
A
Thyroxine
7
Q
Higher with stress; higher levels at 4 and 8 AM and at 8 and 10 PM
A
Prolactin
8
Q
Peaks early to late morning; decreases up to 30% during the day
A
Iron
9
Q
4% decrease supine
A
Calcium
