D.C. Mun. Regs. tit. 22, r. 22-B144
A student who has not received a primary immunization shall receive a total of three (3) doses. The second dose shall be administered not earlier than four (4) weeks and not later than eight (8) weeks after the first dose. The third dose shall be administered no earlier than eight (8) weeks after the second dose and no earlier than sixteen (16) weeks after the first dose.
Hepatitis B doses administered before the age of seven (7) may satisfy § 144.1, unless administered at less than the required age or minimum interval between each dose.
As an alternative to the requirements of §§ 144.1 and 144.2, an unvaccinated student between eleven (11) and fifteen (15) years of age may receive a two (2) 1mL-dose schedule of ten (10) micrograms per milliliter (mcg/mL) of Recombivax HB given between four (4) and six (6) months apart. This alternative shall apply only for students vaccinated between eleven (11) and fifteen (15) years of age. The first dose shall be administered between eleven (11) and fifteen (15) years of age, and the second dose shall be administered before age sixteen (16). The student's parent or legal guardian shall provide written certification of proper administration of the two (2)-dose schedule to the student's school. The certification shall include correct formulation for both doses administered according to the correct schedule.
D.C. Mun. Regs. tit. 22, r. 22-B144