What "go now," "call now," and "call today" actually mean where you live

Every post and every page here uses the same four verbs on purpose: go now, call now, call today, mention at the next visit, so the short version stays short. This page is the one place those verbs turn into an actual number or building, for the US, Canada, and the UK. Pin it or bookmark it; you won't need to remember any of this until you do.

Go now: call 911 / 999 / your local emergency number, or go straight to the ER

United States

Call
911
Or go to
The nearest Emergency Room

Canada

Call
911
Or go to
The nearest Emergency Room

United Kingdom

Call
999
Or go to
A&E. Do not drive yourself; call 999 for an ambulance or have someone else drive
USCanadaUK
Call911911999
Or go toThe nearest Emergency RoomThe nearest Emergency RoomA&E. Do not drive yourself; call 999 for an ambulance or have someone else drive

911 reaches emergency dispatch across the large majority of the US and Canada, on the same shared network, though coverage can be thinner in some remote areas. The UK guidance is direct: for a rash that doesn't fade under pressure, don't drive yourself to A&E. Call 999 for an ambulance, or get someone else to drive.

Call now: the fever rule for a baby under 3 months old

Reserved for exactly one situation: a fever of 38°C (100.4°F) or higher in a baby under 3 months old. This is the call-today ladder below, done immediately, with the go-now fallback the moment you can't get through fast or you're genuinely worried.

United States

Call immediately
Your pediatrician's office or after-hours line
Can't get through fast, or you're worried
Go straight to urgent care or the ER: this is go now

Canada

Call immediately
Your child's doctor, or your province's health line (see Call Today below)
Can't get through fast, or you're worried
Go straight to the ER: this is go now

United Kingdom

Call immediately
111 now. It covers babies by phone and will escalate to 999/A&E itself if needed
Can't get through fast, or you're worried
Go straight to A&E: this is go now
USCanadaUK
Call immediatelyYour pediatrician's office or after-hours lineYour child's doctor, or your province's health line (see Call Today below)111 now. It covers babies by phone and will escalate to 999/A&E itself if needed
Can't get through fast, or you're worriedGo straight to urgent care or the ER: this is go nowGo straight to the ER: this is go nowGo straight to A&E: this is go now

Call today: same-day, not a routine appointment

United States

First call
Your pediatrician's office. After-hours calls are commonly routed to an on-call nurse or provider
If you can't reach them
An urgent care clinic — see below
If it's urgent but not go-now
An urgent care clinic

Canada

First call
Your child's doctor, pediatrician, or a walk-in clinic
If you can't reach them
Your province's health line, where confirmed (see below); otherwise your pediatrician or your province's health ministry site
If it's urgent but not go-now
An urgent care or walk-in clinic

United Kingdom

First call
111, or your GP surgery during the day
If you can't reach them
111 covers this: it exists for when your GP is closed
If it's urgent but not go-now
111 will direct you, including to A&E if that's warranted
USCanadaUK
First callYour pediatrician's office. After-hours calls are commonly routed to an on-call nurse or providerYour child's doctor, pediatrician, or a walk-in clinic111, or your GP surgery during the day
If you can't reach themAn urgent care clinic — see belowYour province's health line, where confirmed (see below); otherwise your pediatrician or your province's health ministry site111 covers this: it exists for when your GP is closed
If it's urgent but not go-nowAn urgent care clinicAn urgent care or walk-in clinic111 will direct you, including to A&E if that's warranted

The Canada health-line picture, honestly

A province-by-province phone line exists in some provinces and isn't confirmed in others. Here's exactly where things stand, not smoothed over.

Mention at the next visit: no urgent contact needed

United States

Who
Your pediatrician, at the next well-child visit

Canada

Who
Your family doctor or pediatrician, at the next well-baby visit

United Kingdom

Who
Your GP or health visitor, at the next routine contact
USCanadaUK
WhoYour pediatrician, at the next well-child visitYour family doctor or pediatrician, at the next well-baby visitYour GP or health visitor, at the next routine contact

In the UK, a health visitor is a qualified nurse or midwife with extra training, and a standard contact point alongside your GP. Visits start before birth and continue through a newborn review around 10 days after birth.

Why the US ladder names more than one stop

Telling a US reader to just "go to the ER" ignores a real cost barrier. So this ladder names the full path: pediatrician's after-hours line, then a nurse line, then urgent care, then the ER, cheapest and often fastest options first. The ER stays available regardless. Under US federal law (EMTALA), an emergency department has to give you an appropriate medical screening exam, and it can't delay that exam to ask about insurance first. That guarantee covers the screening and stabilizing you, not the bill; a charge can still follow later. That's exactly why the earlier steps on the ladder matter for anything short of go-now. They're usually faster and cheaper, and go-now is never held up by cost either way.