Table 1.

Storage conditions and sample dilution

Pre-analytical treatment	Duration of storage prior testing
Original sample (undiluted)	0–1 days at 4 °C (2–8 °C)
1:5 dilution*	1–3 days at 4 °C (2–8 °C)
1:5 dilution	3–5 days at 4 °C (2–8 °C)
1:5 dilution	6–8 days at 4 °C (2–8 °C)
undiluted sample**	7–90 days at ≤–18 °C

^*Storage undiluted, 1:5 dilution immediately prior testing.

^**n = 27 samples.