TABLE 4.

Platelet-rich plasma preparation protocols of included primary cicatricial alopecia studies.

References	No. of session	Interval	Max F/U	Route of application	Protocol/rpm or G	Activator	Blood volume/PRP volume
Case series/case reports
Bolanča et al. (56)	3	4 weeks	12 weeks	Intralesional injection	Double spin method ● 500 G–10 min ● 1520 G–10 min	NR	15/3 ml
Jha (57)	4	3 weeks	12 weeks	Intralesional injection	NR	NR	NR/NR
Özcan et al. (58)	5	4 weeks	20 weeks	Intralesional injection (0.1 ml/cm2)	Single spin method ● 4000 rpm–10 min	NR	14 ml/NR
Jha (59)	4	3 weeks	12 weeks	Intralesional injection	NR	NR	NR/NR
Dina and Aguh (60)	3	4 weeks	12 weeks	NR	Single spin method ● 1100 G–6 min	0.5-M CaCl2	9/4–4.2 ml
	3	4 weeks	12 weeks	NR	Single spin method ● 1100 G–6 min	0.5-M CaCl2	9/4–5 ml
Svigos et al. (61)	Until disease stable	NR	NR	Intralesional injection	NR	NR	NR/NR
Suh et al. (62)	3	4 weeks	12 weeks	NR	Single spin method ● 1100 G–6 min	0.5-M CaCl2	9/4–5 ml
	3	6–9 weeks	20 weeks	NR	NR	NR	NR/NR
Polster et al. (63)	3	12 weeks	36 weeks	Intralesional injection	Single spin method ● 3500 rpm–10 min	NR	22/7 ml
Klein et al. (64)	3	4 weeks	12 weeks	Intralesional injection (0.1 ml/cm2)	Single spin method	NR	NR/5 ml

CaCl₂, calcium chloride; FCL, fractional CO₂ laser; G, gravitational force; NR, not reported; PRP, platelet rich plasma; rpm, revolutions per minute.