TABLE 1.

The physiological concentration of glucose in different fluids.

Body fluids	pH	Glucose concentration rangea	Viscosity (Pa s)	References
Blood	7.35–7.45	2–30 mM	1.52–1.54	Corrie et al. (2015)
				(Heller and Feldman, 2008)
				(Gudmundsson and Bjelle, 1993)
Urine	4.5–8	0–0.8 mM	0.6–1.2	Corrie et al. (2015)
				(Lankelma et al., 2012)
				(Inman et al., 2013)
Interstitial fluid	7.2–7.4	2–22.2 mM	—	Corrie et al. (2015)
				(Koschinsky and Heinemann, 2001)
Saliva	6.2–7.6	0.03–0.08 mM	2–8	Baliga et al. (2013)
				(Ye et al., 2013)
				(Kazuya et al., 2016)
Tear	6.5–7.6	0.1–0.6 mM	1.5–3	Makaram et al. (2014)
				(Yao et al., 2011)
				(Tiffany, 1991)
Sweat	4.5–7	0.02–0.6 mM	0.92	Heikenfeld, (2016)
				(Moyer et al., 2012)
				(Corrie et al., 2015)

^aIndicates the concentration of a healthy adult in fasting.