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Table 4 Time and volume of sampling

From: Protocol of the VICTORIA study: personalized vitamin D supplementation for reducing or preventing fatigue and enhancing quality of life of patients with colorectal tumor - randomized intervention trial

Setting No. of sample Phase of
clinical trial
Blood Sampling Urine Sampling
EDTA tube Serum tube
Inpatient 1 Screening 1 × 2.6 ml 1 × 7.5 ml 1 × 10 ml
2 Day 12 to 21 1 × 2.6 ml 4 × 7.5 ml 2 × 10 ml
Outpatient 3 Week 13 to 16 1 × 2.6 ml 1 × 7.5 ml, 3 × 9 ml  2 × 10 ml