. 2018 Nov 4;13(2):88–91. doi: 10.1177/1753495X18786422

Table 1.

Endocrine investigations.

Gestational age:	K + mmol/L(N 3.5–5.0)^a(N 3.3–5.0)^b	Aldosteronepmol/L(N < 1118)^a(N 250–2885)^b	Reninng/L(N 1.7–23.9)^a,c	Progesteronenmol/L(N 0.3–86.0)^a(N 315–1088)^d	ARR(N < 144)^a	Aldosterone to progesterone ratio(N 18--80)⁵
17 Weeks	3.5	2570	30.4		85
18 Weeks	3.1	>2770	76.4		>36
19 Weeks	3.9	3000	40.7		74
25 Weeks	3.8	2690	24	310.0		36.2
3 Weeks PP	4.2	539	5.2		104

ARR: aldosterone renin ratio; PP: post-partum.

^aNon-pregnancy reference values.

^bSecond trimester reference range.¹

^cNo established references ranges for plasma renin concentration in pregnancy; normal second trimester plasma renin activity is 7.5–54.0 ng/mL/h.

^dThird trimester reference range.¹