Lateral flow home test kits are unavailable on the UK Government website, as people wait to book a coronavirus vaccine.
The Government website on Monday said "there are no more home tests available".
It advised people to "try again later" or to book a test site appointment instead.
One person said on Twitter: "Tried to order a lateral flow test kit and the NHS site says they have no more! What's going on!"
However, there appeared to be no problems with the availability of PCR home test kits.
It comes as people try to book a Covid -19 booster jab in Scotland on the first day that 30-39 year olds can get an appointment.
Nicola Sturgeon announced the covid vaccine booster programme will be accelerated so all adults are offered a third jab by the New Year.
She said "urgent work" is underway to boost public immunity in the face of the O micron variant sweeping the country.
The SNP leader issued a statement moments after Boris Johnson finished a televised address at 8pm in which the Prime Minister warned the UK faced a "tidal wave" of infections.
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