Table 3.

Mean levels of serum 25 (OH) D among pregnant women

Study	Vitamin D estimation method	Mean serum 25(OH) D	25 (OH) D ranges in serum
			Deficiency	Insufficiency	Sufficiency/adequacy
Ajmani et al. 2016 [35]	ELISA	23.25 ng/ml ± 18.49	< 20 ng/ml	20–30 ng/ml	> 30 ng/ml
Farrant et al. 2009 [32]	Radioimmunoassay	Median: 15.12 ng/ml	< 20 ng/ml	NM	NM
Jani et al. 2014 [9]	Chemiluminescent immunoassay	10.6 ng/mL	< 20 ng/ml	<20–30 ng/ml	30 ng/ml
Marwaha et al. 2011 [7]	ELISA	9.28 ng/ml	< 20 ng/ml	NM	NM
Sachan et al. 2005 [31]	Radioimmunoassay	14.93 ng/mL	< 20 ng/ml	NM	Normal: 20–80 ng/ml nmol/L
Sahu et al. 2009 [33]	Radioimmunoassay	15.12 ng/ml ± 7.92	< 20 ng/ml	NM	30 ng/ml
Sharma et al. 2016 [36]	ELISA	Deficiency: 7.10 ± 1.49 ng/ml	Severe < 10 ng/ml	Deficient < 20 ng/ml)	Normal 32–100 ng/ml
Singla et al. 2015 [34]	ELISA	Median: 7.9 ng/ml (IQR 5.7, 12	< 20 ng/ml	< 20–30 ng/ml	30 ng/ml
Krishnaveni et al. 2011 [37]	Radioimmunoassay	15.6 ng/ml	< 20 ng/ml	NM	NM
Veena et al. 2017 [38]	Radioimmunoassay	NM	< 20 ng/ml	NM	NM
Nandal et al. 2016 [39]	ELISA	11.98 ng/ml	< 12 ng/ml	12–20 ng/ml	20–30 ng/ml
Kumar et al. 2015 [40]	LC-MS/MS	16.3 ng/ml	< 20 ng/mL	NM	NM
Chary et al. 2015 [41]	HPLC	NM	< 19 ng/mL	20–29 ng/mL	> 30 ng/mL
Dasgupta et al. 2012 [42]	Radioimmunoassay	38.4 ± 18.37 ng/ml	< 20 ng/ml	NM	NM
Sablok et al. 2015 [43]	ELISA	18.44 ng/ml	< 20 ng/ml	< 20–30 ng/ml	30 ng/ml

NM not mentioned, IQR inter quartile range, SD standard deviation