Table 3.

Non-blood biological and environmental sample collection and processing at home visit in the GuLF STUDY (n=11,193)

Specimen	N (%) of participants	Processing in home	Dispositiona	Shipment temperature	Long-term storage temperatureb
Urine	11,061 (98.8)	Reagent strip urinalysis on small sample; 16 mL transferred to preservative tubes; 24 mL left unpreserved	HVS: All stored	4°C	LN2 and −80°C
			BSS: Urinalysis of ∼8 mL; remainder stored	4°C	LN2 and −80°C
Toenail clippings (n=10)	9,993 (89.3)	None	Stored	Ambient	Ambient
Hair	4,428 (39.6)	None	Stored	Ambient	−20°C
Saliva (for DNA)c	613 (76.2)	None	Stored	4°C	−20°C
House dust wipes	10,615 (94.8)	None	Stored	Ambient	−20°C
Vacuum dust	176	None	Stored	Ambient	−20°C

^aHVS=Home Visit Subcohort; BSS=Biomedical Surveillance Subcohort

^bLN2=vapor phase of liquid nitrogen

^cAmong participants who refused or were unable to provide blood samples